We're dividing 20811 by 36 
The aim is to understand the frequency of 36 in 20811.

Going ahead to step 1:
When dividing 2 by 36, we get 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 36

Advancing to step 2:
If we divide 20 by 36, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 20 leaves us with 20.
Bring next digit (8) of the dividend behind the 20 and repeat the process: 208 / 36

Advancing to step 3:
The number 36 fits into 208 5 times, leaving a remainder of 28.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
The remainder is 28 after subtracting 180 from 208.
Bring next digit (1) of the dividend behind the 28 and repeat the process: 281 / 36

Let's proceed to step 4:
When dividing 281 by 36, we get 7 with a remainder of 29.
The number 7 becomes the next digit in our result. 
Result so far: 57.0
Subtracting 252 from 281 leaves us with 29.
Include the next digit (1) from the dividend after 29, then repeat: 291 / 36

Going ahead to step 5:
The number 36 fits into 291 8 times, leaving a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 578.0
Deduct 288 from 291 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 6:
If we divide 30 by 36, we get 0 and a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 578.0
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 7:
300 divided by 36 is 8 with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 578.08
If we take 288 away from 300, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
When dividing 120 by 36, we get 3 with a remainder of 12.
Write down 3 as next digit of the result. 
Result so far: 578.083
Deduct 108 from 120 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 9:
36 goes into 120 3 times with a remainder of 12.
Put 3 as the next digit of the answer. 
Result so far: 578.0833
Subtracting 108 from 120 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Our division results in 578.0833 with a remaining 0.00012.